Elevator mechanism.



No. 802,074. PATENTED OCT. 17, 1905. J. DILLON.

ELEVATOR MECHANISM.

APPLICATION FILED DEC. 19, 1904.

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J. DILLON.

I ELEVATOR MECHANISM.

APPLICATION FILED DEC. 19. 1904.

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No. 802,074. PATENTED OCT. 1'7, 1905.

J. DILLON. v ELEVATOR MECHANISM.

APPLICATION FILED DBO.19, 1904.

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UNITED STATES Parana orrion.

ELEVATOR MECHANISM.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed December 19, 1904. Serial No. 237,496.

To all whom it ntay concern:

Be it known that I, JOHN DILLON, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and usefulImprovements in Elevator Mechanism; and I do hereby declare that the following is a full, clear, and exact description thereof.

Like in my Patents No. 742,173, issued October 27, 1903, and No. 785,936, issued March 28, 1905, the invention herein particularly set forth, with reference to the accompanying drawings and subsequently claimed, is especially applicable to electric elevators, its ob' ject being to prevent overrunning of an elevator-car at terminal landings and to provide for automatic setting of an emergency-brake of an elevator-engine should the operator fail to do the work necessary for a stop at either terminal landing, said invention being specific to an electromagnet in a normally closed circuit, automatic predetermined breaking of which circuit results in setting of said brake that is mechanically tightened in proportion to the momentum acquired by said engine.

Figure 1 of the drawings represents an elevation of an electric elevator-engine in which my improvements are embodied; Fig. 2, a partly transverse section of the engine indicated by line 2 2 in Fig. 1, and .Fig. 3 a partly sectional detail view of brake-setting mechanism involving an electromagnet in normally closed circuit.

Referring by letter to the drawings, A indicates the brake-pulley of an elevator-engine preferably of the kind organized to be actuated by an electric motor controlled from within the elevator-car by switch mechanism, as is common practice and known as full magnet control. The brake wholly under control of the operator in the elevator is omitted from the showing, for the reason that it is common in the art and forms no part of the invention herein set forth.

As also shown in the patent and application above noted, a portion of the cable-drum shaft B of the engine is screw-threaded and engaged with a traveling clutch-nut C, that has its play between a pair of other clutchnuts D, adjustable on said shaft, but fast thereon in adjusted position distant from one another in proportion to the distance between The shank Z) of the clutch-nut C plays in the longitudinally-slotted web OZ, connecting the cam E and pulley E, loose on the drum-shaft, and at about the time the elevator-car arrives at either terminal landing a clutch of said nut with one of the nuts D takes place to impart rotary motion to said cam and pulley against suitable yielding resistance,the weight F, connected to the aforesaid pulley by the sheavesupported flexible device 0, being one form of such resistance. The cam E, astraddle of the lever G, has its grooves engaged by the lugs or rollers f at one end of said lever. The lever H is connected by the pivot-bolt g with the lever G, and one end of said lever H is herein shown in pivotal connection with the frame of the engine. The lever I, in connection with lever G, has toggle connection with the friction-shoes J that oppose the brakepulley A of the engine, these shoes and the mechanism in connection therewith being an emergency-brake, to which especial reference is had herein. The offset end of the lever H is shown in pivotal connection with a sliding core K, guided in a fixed core L of an electromagnet, the coil M of which is within a casing N, having a shank N made fast to a gear-casing O of the engine, the magnet-casing being also a guide for said sliding core, that is provided at its upper end with a seat It for a spiral spring P of suitable power, compressible against a cap-plate 2', held by nuts on collars of posts j, surmounting said magnet-casing.

A peripheral lug In of the cam E is shown in opposition to an antifriction-roller m, carried by a preferably spring-controlled vertically-sliding stem a, guided in a box Q, in insulated connection with the gear-casing aforesaid. Insulated on the stem 7% is a blade 12, opposed to a pair of contacts q q, the whole constituting an electric switch. The contact (1 is wired to a terminal of the electromagnetcoil M, and the other terminal of said magnetcoil is connected to the positive side of the line by which current is supplied to the magnet. The contact g' is connected to the negative side of the line aforesaid, and the circuit is normally closed through the electromagnet by bridging of said contact and contact 11, the blade 19 being herein shown held up, with its stem 11,, against spring resistance by the lug 7c of the cam E aforesaid. The wire r, connecting the contact q with a terminal of the electromagnet, is tapped by another wire 8, having a switch or push-button terminal it normally out of contact with a similar termina] 14 of a wire o in connection with the negative side of the line. The switch or pushbutton is in any convenient or desirable location, and, as herein shown, a portion of the wires 8 '0 may be flexible conductors to permit of their switch or push-button terminals being located in the elevator-car.

In practice if the operator of the elevator fails to do the work necessary for a stop at a terminal landing the traveling clutch-nut C will engage one of the other clutch-nuts D, and thereby cause rotary motion of the cam E, the result being clearance of the antifriction-roller m by the cam-lug 7a to permit drop of the blade p from the contacts q q, thus breaking the circuit through the electromagnet. The spring P is now free to expand, and depression of the sliding core K of the magnet results in an operation of the levers G H I to set the brake-shoes J against the opposing pulley. The pressure thus applied is not at all times sufficient to stop the movement of the elevator machinery; but continued rotary motion of the cam E will result in further tilt of the aforesaid levers to increase said pressure until the desired result is accomplished. The spring P prevents sticking of the sliding core K in the electromagnet and insures a sudden setting of the brake; but said spring may be omitted and the cam E relied upon to cause a brake-setting operation of the lever mechanism herein shown and described.

To release the emergency-brake, the switch or push-button terminal 6 is closed against the one u to complete a circuit through the electromagnet, the result being a return of the sliding core K and levers Gr H I to normal position against resistance of the spring P opposing said core. At the same time the machinery is started in the proper direction to permit automatic return of the cam E to normal position, the result of which is a closing of blade 19 on contacts (1 q to complete a circuit through the electromagnet, and this being done the hand-switch or push-bntton is opened.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- Y 1. An elevator mechanism embodying a brake, an electromagnet, brake-controlling mechanism in connection with the magnet that is normally energized to maintain a release of the brake, means for predetermined deenergization of said magnet to apply the brake, and means for automatically increasing pressure of the applied brake.

2. An elevator mechanism embodying a brake, a normally energized electromagnet having a sliding core, a system of levers connecting the brake and said core of the magnet, means for predetermined deenergization of said magnet to apply the brake, and means independent of the magnet for gradually increasing leverage on the applied brake.

3. An elevator mechanism embodying a brake, an electromagnet, brake release and setting means controlled by the magnet, a switch in normally closed circuit with said magnet, and means for automatic predetermined opening of the switch.

4. An elevator mechanism embodying a brake, an electromagnet, brake release and setting means controlled by the magnet, a switch in normally closed circuit with said magnet, means for automatic predetermined opening of the switch, and means independent of the magnet for increasing pressure of the applied brake.

\ 5. An elevator mechanism embodying a brake, an electromagnet, brake release and setting means controlled by the magnet, a switch in normally closed circuit with said magnet, means for automatic predetermined opening of the switch, and means for manual closing of the magnet-circuit preliminary to an automatic closing of said switch.

6. An elevator mechanism embodying a brake, an electromagnet, brake release and setting means controlled by the magnet, a'

switch in normally closed circuit with said magnet, means for predetermined opening of the switch to permit setting of the brake, and means for insuring application of said brake when the switch is opened.

7 An elevator mechanism embodying a brake, an electromagnet having a sliding core, a spring arranged to be compressed by the core when the magnet is energized, a brake release and setting means in connection with said core of the magnet, a switch in normally closed circuit with said magnet, and means for automatic predetermined opening of said switch.

8. An elevator mechanism comprising a brake, a traveling clutch on a drum-shaft between clutch' devices fast on the same shaft, a cam loose on said shaft, a clutch-guide in connection with the cam, a system of levers in connection with the cam and brake, a yielding resistance to movement of the cam by the clutch, an electromagnet having asliding core in connection with one of the levers in said system of same, a cam-controlled switch normally in closed circuit with the magnet, and means for manual closing of the magnet-circuit preliminary to automatic closing of said switch. a

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

J N O. DILLON.

Witnesses:

N. E. OLIPHANT, GEORGE FELBER. 

